<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        function move ({x =0 ,y =0} = {}){
            return[x,y];

        }
        console.log(move({x:3,y:8}));//[3,8]
        console.log(move({x:3}));//[3,0]
        console.log(move({}));//[0,0]
        console.log(move());//[0,0]

    </script>
</body>
</html>